If time sync is very important to you and you have several machines then I strongly suggestion you setup one of your boxes to be a local NTP server. Do not have every computer hitting the outside world.
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ZoredacheJul 26 '11 at 21:28

@Michael - I haven't had much luck with JdeBP's advice. I think his links are Windows Server 2008 related and I don't know if they are applicable for Win7
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JonathanJul 26 '11 at 21:39

@Zoredache - the machines are in different places in the world. On Win Server 2008 I was able to maintain 30ms accuracy most of the time with the registry tweaks I linked to.
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JonathanJul 26 '11 at 21:43

1 Answer
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If the default Windows capabilities/programmability does not meet your requirement, then you might consider any one of the many numerous time synchronization utilities available. There is a good chance that there are multiple utilities which can meet your requirements.

I agree here. Particularly if you need 30ms or better accuracy. The Built in Windows sync just isn't that great. There are full NTP daemons that will run under windows. meinberg.de/english/sw/ntp.htm
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ZoredacheJul 26 '11 at 21:35

@Zoredache - THAT link was a lifesaver. Why not write it as an answer? Who knows, I might accept it ;)
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JonathanJul 26 '11 at 22:03